The original rule book just says channelling, but the Wizards Staff card that comes with 'Winds of Magic' says to add a fortune dice to both Channelling and Spellcraft checks. Which is it?

The "Attuned x" property is for Channeling skill checks.

You can ask thru the rule question link at the bottom of the page, but maybe it's an item specific bonus (like it's Attuned 1 and it's also of Superior quality which gives a fortune to Spellcraft checks). I don't have the card close by to check it out.